core-image-tiny: Provide a new image recipe for poky-tiny that boots from RAM

This new image recipe creates an image from the artifacts
obtained after building core-image-tiny-initramfs, it boots
directly to a tiny rootfs provided by initrd

Signed-off-by: Alejandro Hernandez <alejandro.hernandez@linux.intel.com>

2 files changed, 37 insertions, 11 deletions

diff --git a/common/recipes-core/images/core-image-tiny-initramfs.bbappend b/common/recipes-core/images/core-image-tiny-initramfs.bbappend
deleted file mode 100644
index 6fe2d7c4..00000000
--- a/common/recipes-core/images/core-image-tiny-initramfs.bbappend
+++ /dev/null
@@ -1,11 +0,0 @@
-# Set WKS file depending on the MACHINE picked by the user applies 
-# only when using an Intel MACHINE, otherwise leaves it as it is.
-
-python (){
-    if d.getVar('MACHINE', True) == "intel-core2-32":
-        d.setVar('WKS_FILE', "systemd-bootdisk-tiny32.wks")
-    elif d.getVar('MACHINE', True) == "intel-corei7-64":
-        d.setVar('WKS_FILE', "systemd-bootdisk-tiny64.wks")
-    elif d.getVar('MACHINE', True) == "intel-quark":
-        d.setVar('WKS_FILE', "mktinygalileodisk.wks")
-}
diff --git a/common/recipes-core/images/core-image-tiny.bb b/common/recipes-core/images/core-image-tiny.bb
new file mode 100644
index 00000000..ed39fd77
--- /dev/null
+++ b/common/recipes-core/images/core-image-tiny.bb
@@ -0,0 +1,37 @@
+SUMMARY = "A tiny image just capable of allowing a device to boot from RAM, \
+this image recipe generates an image file which rather boots from initrd than \
+from storage, it achieves this by using wic to pick up the artifacts generated \
+by the core-image-tiny-initramfs image"
+
+# The actual rootfs/initrd will be the one from core-image-tiny-initramfs, so
+# we reset IMAGE_INSTALL to avoid building other things that will be pointless
+IMAGE_INSTALL = ""
+
+# Do not pollute the initrd image with rootfs features
+IMAGE_FEATURES = ""
+
+IMAGE_LINGUAS = " "
+
+LICENSE = "MIT"
+
+IMAGE_ROOTFS_SIZE ?= "8192"
+
+IMAGE_FSTYPES = "wic"
+inherit core-image
+
+# We get some parts from image-live that we need in order to boot from initrd
+INITRD_IMAGE_LIVE ?= "core-image-tiny-initramfs"
+
+python() {
+    image_b = d.getVar('IMAGE_BASENAME')
+    initrd_i = d.getVar('INITRD_IMAGE_LIVE')
+    if image_b == initrd_i:
+        bb.error('INITRD_IMAGE_LIVE %s cannot use the requested IMAGE_FSTYPE' % initrd_i)
+        bb.fatal('Check IMAGE_FSTYPES and INITRAMFS_FSTYPES settings.')
+    elif initrd_i:
+        d.appendVarFlag('do_image', 'depends', ' %s:do_image_complete' % initrd_i)
+}
+
+WKS_FILE_intel-corei7-64 = "core-image-tiny.wks.in"
+WKS_FILE_intel-core2-32 = "core-image-tiny.wks.in"
+WKS_FILE_intel-quark = "mktinygalileodisk.wks"